Water resources and landslides: the case study of the Semoigne catchment (Paris basin, France)

The old landslides of the Semoigne catchment exhibit superficial reactivations, which mechanism is not well-known, in particular the water pathway within the internal body of the landslide. Hydrological approach is based on the identification of the aquifer levels, the cartography of the springs and the spatial characteristics of the water resources derived from serial hydrological measures. Cross-correlation of hydrological and geomorphological data points out the interactions between aquifer and mass movement. The draining of the aquifer essentially occurs in the lower Semoigne valley, where large inherited landslides remain. If cataglacial period account for hydrological excess leading to slope failure, Holocene reactivations are also linked with groundwater supply rather than with infiltration of rain water.